Shot shell tube



y 24, 1934- A. e. SCHURICHT 1,967,844

SHCT SHELL TUBE F iled June so. 1932 Au a/vs 6'. 50/02/607;

Patented July 24, M 1,967,844

UNITED STATES PATENT OFFICE,

snor SHELL TUBE Alfons G. Schuricht, Alton, Ill., assignor to Westem Cartridge Company, East Alton, 111., a corporation of Delaware iApplication June 30, 1932, Serial No. 620,190 3 Claims. (CL'- 9394) This invention relates generally to shot shells, A further object of this invention is to provide and particularly to a method of manufacturing a shot shell tube having a metallic film in the shot shell tubes whereby the same are rendered walls' thereof and so constructed and arranged impervious to powder gases and the usual charthat the metallic film does not interfere with the 5 ring or burning is reduced. action of the usual adhesive.-

he Ordi a y S ot gun shell consists of a paper A more specific object of this invention is to tube comprising a plurality of convolutions upon provide a process of making shot shell tubes one end of which there is mounted a metallic wherein the treating material is applied to the head and in which there is contained a charge shot shell tube paper as a spray.

10 of powder and shot suitably wadded. In the Other objects will become apparent to those 5 manufacture of shot shell tubes the customary skilled in the art when the following description procedure is to roll a sheet of paper of sunicient is read in connection with the accompanying length to form four or five tubes into a long tube. drawing, in which:-

This roll generally comprises four or five convo- Figure 1 is a perspective view'illustrating one 1| lutions and after being wound on a suitable manform of apparatus for applying the tube treatdrel and joined together by adhesive or cement ing material in accordance with the present inthe long tube may be cut to form shot shell tubes vention. of an appropriate length. It is well known,-how- Figure 2 is a plan view of a sheet of paper ever, that paper is not itself impervious to the treated in accordance with the present invention.

:0 penetration of hot powder gases and consequently Figure 3 is a detail view of a loaded shot shell, efforts have heretofore been made to so treat the tube of which is formed from a sheet of shot shell tubes so as to render the same more paper treated as shown in Figure 2 and having gas-proof. Furthermore an ordinary paper shot a section torn away to expose the convolutions. shell tube will ordinarily badly char or burn, es- Figure 4 is a plan view of a sheet of paper 25 pecially the inner convolutions thereof which are treated in accordance with the present invenexposed to fire. This burning weakens the tube tion and having the treated portion in such poto such an extent that it will either cut 011' comsition that the material deposited will form the pletely, fracture or split. Among the efforts innermost wall of the tube. which have heretofore been made to overcome Figure 5 is a longitudinal sectional view of a so these unfavorable conditions which are present shot shell tube formed from a sheet of paper 35 in ordinary paper shot shell tubes is the provision treated in accordance with Fig. 4. of a suitable gas proofing and heat absorbing me- In accordance with the present invention gendium between the convolutions of the tube. Thin erally stated a film of suitable material adapted sheets of metal foil have been inserted as metal to render shot shell tubes impervious to hot pow- 35 inlays for this purpose, but it will be understood der gas and prevent weakening or fracturing that considerable difficulty and additional manof the tube incident to burning or charring is ufacturing'expense is encountered when this proapplied to a portion of a sheet of paper which cedure is followed. The sheet. of metal foil alis subsequently to be rolled into tube form. In though satisfactory in that it provides not only accordance with the present invention a film of 40 a gas proof wall but also reduces the burning such material is sprayed on to a sheet of paper,

or charring and consequently avoids disadvanit being understood that the material is first tages of cut 011's and fractures of the tube, is, reduced to liquid form and then atomized by nevertheless disadvantageous from the manufacsuitable mechanism. In this manner it is posturing standpoint. It is among the objects of the sible to accurately control the thickness of the 45 present invention therefore to' provide a shot coating applied and in case of metal the coating shell tube and the process of making the same adheres very firmly to the paper and is non- I whereby all the advantages of metal foil inserts porous and dense. The reason that the coating inshot shell. tubes may be taken advantage of and adheres firmly to the paper is because of the the process of manufacture at the same time so fact that the metal when sprayed on the paper so simplified as to render the metallic treatment of penetrates and sinks into the porous surface of 0 shot shell tubes practical. the sheet. This not only permits the sheet to An object of the present invention generally be readily rolled into a closely wound tube avoidstated is to provide a process of applying a coating displacement, as distinguished from where ing of metalor other gas-proofing and char-rea loose sheet of metal is employed, but it also 55 ducing material to shot shell tubes. improves the structure of the resultant shell and in accordance with avoids burning or charring which would cause weakening or fracturing of the tube. It will be understood that it is not necessary to coat the entire sheet of paper which is subsequently to be wound to tube form but only sufficient thereof to constitute one complete convolution of the tube need be coated. In view of the fact that the coating or treating material when applied the present invention adheres very firmly to the sheet of paper it is apparent that the entire sheet, if desired, may be coated since the presence of the film or coating does not interfere with the action of the usual cement or adhesive. Ordinarily, however, only one or two convolutions of the tube will be coated and it will be understood that these convolutions will be either in such position as to form interior walls of the tube or such as to form the innermost wall which will be'in contact with the charge. Tubes treated in accordance with the present invention advantageously lend themselves to the usual water proofing treatments.

Referring now particularly to the drawing for an illustrative embodiment of the present invention which will be described with particular reference to the application of metal as a spray, a sheet of paper 1 is shown which in accordance with the usual practice is of such size that the same may be sub-divided along lines 2 so that in the embodiment illustrated the sheet after being rolled into tube form may be subdivided axially to form individual shot shell tubes of the desired length. In the embodiment illustrated the sheet 1 is provided with a coating 3 of metal which may be for instance copper, aluminum, zinc, lead, tin, iron, nickel, or any of the various alloys. It will be understood, therefore, that the invention is not limited to the use of any particular material or metal but that practically all metals may be applied in accordance with the present invention and advantageous results achieved. In accordance with the present invention the coating 3 is as before mentioned applied in the form of a spray. The metal may first be reduced to liquid form and applied through a suitable atomizing nozzle. In the embodiment diagrammatically illustrated in Figure 1, however, the metal is fed to a nozzle 4 in the form of a wire 5. As the wire 5 passes through nozzle 4 the same is melted by means of a suitable flame, as for instance an oxy-hydrogen or oxy-acetylene flame. The oxygen, for instance, may be introduced into nozzle 4 through a suitable conduit 6 while the hydrogen or acetylene may be introduced through conduit '7. It will be understood that the gas after leaving the respective conduits may be fed to a nozzle in such manner as to produce the hot flame well known to those skilled in the art. The nozzle 4 may also be supplied as through a conduit 8 with compressed air which may, for instance, be so directed as to atomize the metal of wire 5 when it is melted at the hot flame within nozzle 4. The atomized metal may then be sprayed directly on the sheet of shot shell paper as illustrated in Figure 1. In this manner the metal is readily applied to the paper and the thickness of the coating may be controlled within narrow limits. It is possible in accordance with the present invention to spray on a coating of metal which is non-porous and dense at any thickness varying from 0.001 inches upward to any desired thickness.

trated in Figure The area or section of the sheet of paper which is covered by the coating 3 may be readily controlled in accordance with the present invention. In the embodiment illustrated in Figure 2 the width of the'coating 3 will be understood to be slightly in excess of the circumference of the finished tube. In this manner the position of the coating 3 with reference to the marginal edges may be accurately controlled and when of this width it will be understood that the coating will form at least one full convolution of the tube. In the embodiment illustrated in Figure 2 the position of the coating 3 with reference to the edges of the sheet 1 is suchthat the coated convolution will appear as one of the interior convolutions of the finished tube.

In Figure 3 there is shell comprising a tube illustrated a loaded shot 9 constructed in accordcup 10. A portion of the tube is broken away to expose the shot charge 11 and wad 12. As illus- 3 the tube comprises four convolutions, the edges of which are indicated as 13, 14, 15 and 16. The convolution whose edge is indicated as 15 is the coated convolution which, it will be apparent, is next to the innermost convolution. It will be understood, however, that the position of the coated convolution may be varied as is desired.

In the embodiment illustrated in Figure 4 the coating-3 is applied to a sheet 1'7 in such position that when wound to tube form it will form the innermost convolution or interior wall of the shot shell tube. In Figure 5 there is illustrated a sectional view of a shot shell the tube of which is wound from a sheet of paper 1'7. In this embodiment the coating 3 forms the wall which comes into contact with the charge contained within the tube while as shown the next succeeding convolutions indicated as 18. 19 and 20 are untreated. From the foregoing description it is apparent that many modifications of a shot shell tube and the process of making the same hereinbefore described will present themselves to those skilled in the art without departing from the spirit of this invention. It is to be understood that the invention is not limited to the specific details set forth for the purpose of illustration or herein referred to. It is to be understood, therefore, that such modifications and the use of such individual features and subcombinations of features as do not depart from the spirit of this invention are, although not specifically described herein, contemplated by and-within the scope of the appended claims.

Having thus described the invention what is claimed is:

1. In the art of making shot shell tubes, the process comprising, spraying metal on a sheet of paper, and rolling the sprayed sheet to form a closely wound hollow tube.

2. In the art of making shot shell tubes, the process comprising, spraying metal on a section of a sheet of paper having a width substantially equal to the circumference of a finished tube, and rolling the sprayed sheet to form a hollow closely wound tube.

3. A shot shell tube comprising a series of convolutions of paper, and a coating of metal penetrating the paper and firmly adhering to one of the convolutions.

ALFONS G. SCHURICHT.

ance with the Figure 2 and having the usual base 

